Pṛthivyāyāma-vistara (Extent and Divisions of the Earth) / पृथिव्यायामविस्तरः
भरणाच्च प्रजानां वै मनुर्भरत उच्यते / निरुक्तवचनाच्चैवं वर्षं तद्भारतं स्मृतम्
bharaṇācca prajānāṃ vai manurbharata ucyate / niruktavacanāccaivaṃ varṣaṃ tadbhārataṃ smṛtam
Because he sustained and nurtured the people, Manu is called Bharata; and by this etymological saying, that land is remembered as Bharata-varsha.